1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
34kurt
3 years ago
6

Solve the system of equations and choose the correct ordered pair. 3x + 4y = 385x - 5y = -30

Mathematics
1 answer:
MrRa [10]3 years ago
8 0
<span>3x + 4y= -30---(1)
</span><span>385x - 5y = -30---(2)

equation (1) times 5 on each side---
(</span>3x + 4y)×5=-30×5
15x+20y=-150 ---(3)

equation (2) times 4 on each side---
(385x - 5y)×4 = -30×4
<span>1540x-20y=-120 ---(4)

If u add equation 3 and 4,
</span>(15x+20y)+(<span>1540x-20y</span>)=(-150)+(-120)
1555x=-270
∴x=-270/1555

You might be interested in
A video game company is designing a game based on professional race cars. Professional race cars have a length of 570 cm and a w
siniylev [52]

Answer:

  A) 1/45

  B) 1/60

Step-by-step explanation:

<u>Part A</u>

The actual car has a length to width ratio of ...

  length/width = (570 cm)/(180 cm) = 57/18 = 3 1/6

The rectangle on the screen has a length to width ratio of ...

  length/width = (13 cm)/(4 cm) = 3 1/4

Relative to its width, the screen rectangle is longer than necessary for a model of the car. So, the scale factor will be determined by the width of the car relative to the width of the screen model.

For a model width of 4 cm, the scale factor is ...

  model/life-size = (4 cm)/(180 cm) = 1/45

__

<u>Part B</u>

For a model width of 3 cm, the scale factor is ...

  model/life-size = (3 cm)/(180 cm) = 1/60

7 0
3 years ago
On the first day of​ June, there were about 17.71 h of daylight in a city. Five months​ later, there were about 5.30 h of daylig
Andru [333]

Answer:

Percentage increases and decreases, are found by setting the problem up proportionally.

 

You are trying to find what percentage of 17.37 is 8.30 first.

 

so What %/100 = 8.30/17.37

 

Now define a variable:

 

Let x = What%  

 

x/100 = 8.30/17.37

17.37x = 830

x = 830/17.37

x ≈ 47.78

 

8.30 is approximately 47.78% of 17.37, so the percentage decrease is 100% - 47.78% = 52.22%

The percentage decrease is approximately 52.22%

7 0
3 years ago
A line passes through the points (3,5) and (2,0) what’s the slope of the line
Fiesta28 [93]

The slope is 5/1. This is because it goes up 5 units and right one unit. This corresponds with the fact that slope is the rise/run on a line.

8 0
3 years ago
Read 2 more answers
What is the length of segment CE if AE = 15 inches and ED = 5 inches and EB = 3 inches?
marshall27 [118]
I do believe the correct and is 9 inches 
3 0
4 years ago
Read 2 more answers
Is the sequence below arithmetic or geometric? Explain
Korvikt [17]

Answer: its geometric

Step-by-step explanation: The numbers are separated and are counting up Individually

8 0
3 years ago
Other questions:
  • Tommy can ride his bicycle 4.5 miles in 15 minutes. How many miles can he ride in 75 minutes
    6·2 answers
  • maria is bringing her sick dog pedro in for a series of appointments at the veterinary clinic. Her total over the course of trea
    5·1 answer
  • Use the rational exponent property to write an equivalent expression for<br> Vas - 2 + 1.
    5·1 answer
  • What is 32 / 10 equal
    6·2 answers
  • A train leaves Chicago traveling west at 60 miles per hour.An hour later,at 12 noon,another train leaves Chicago traveling east
    13·1 answer
  • Do the set of points in the figure represents a function? Yes No
    9·2 answers
  • Graph the inequality.<br> c&lt; -6
    7·2 answers
  • Someone please help me, i’ll mark brainliest answer !
    13·1 answer
  • How long does it take for the ball to hit the ground (in seconds) rounded to the nearest hundredth
    7·2 answers
  • Solve the inequality and express your answer in interval notation<br> ILL GIVE YOU BRAINLYEST
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!